如何驗證javascript中的電子郵件

Question

我正在mvc 5項目中聯繫我們頁面我希望用戶發送管理員他/她的emaiul地址.so我想驗證電子郵件在JavaScript頁上。我寫了一些代碼這不能正常工作。我希望你能幫助我。

<script language="javascript"> 
    function f1() { 
     var inputText = document.getElementById("email").value; 
     var mailformat = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/; 
     if (inputText.value.match(mailformat)) { 
      document.form1.text1.focus(); 

     } 
     else { 
      alert("You have entered an invalid email address!"); 
      document.form1.text1.focus(); 
      event.preventDefault(); 
     } 
    } 
</script> 

Answer 1

function validateEmail(email) { 
    var re = ([\w-+]+(?:\.[\w-+]+)*@(?:[\w-]+\.)+[a-zA-Z]{2,7}); 
    return re.test(email); 
} 

Answer 2

一個基本的HTML和JS用JS驗證電子郵件工作代碼在這裏給出了U-

function validateForm() 
 
{ 
 
    var x = document.forms["myForm"]["email"].value; 
 
    var atpos = x.indexOf("@"); 
 
    var dotpos = x.lastIndexOf("."); 
 
    if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length) 
 
    { 
 
     alert("Not a valid e-mail address"); 
 
     return false; 
 
    } 
 
    else 
 
    { 
 
     alert("Valid e-mail address"); 
 
     return true; 
 
    } 
 
}

<form name="myForm" action="demo_form.asp" onsubmit="return validateForm();" method="post"> 
 
    Email: <input type="text" name="email"> 
 
    <input type="submit" value="Submit"> 
 
</form>

想想，u有你的答案:)

Answer 3

<form name="form" action="#" onSubmit="return f1()" method="POST"> 
    <input type="email"> 
</form> 
<script> 
function f1(){ 
    var email = document.forms["form"]["Email"].value; 
    var regex = /^([0-9a-zA-Z]([-_\\.]*[0-9a-zA-Z]+)*)@([0-9a-zA-Z]([-_\\.]*[0-9a-zA-Z]+)*)[\\.]([a-zA-Z]{2,9})$/; 
    if(!regex.test(email)){ 
     alert("You have entered an invalid email address!"); 
     return false; 
    } 
} 
</script>  

Answer 4

你不想只是inputText.valueinputText這樣

<input type="text" id="email" /> 
 
<input type="submit" onClick="f1()"/> 
 

 

 
<script language="javascript"> 
 
    function f1() { 
 
     console.log(document.getElementById("email").value); 
 
     var inputText = document.getElementById("email").value; 
 
     console.log(inputText) 
 
     var mailformat = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/; 
 
     if (inputText.match(mailformat)) { // <<<<<<< here 
 
      //document.form1.text1.focus(); 
 
      alert("correct") 
 

 
     } 
 
     else { 
 
      alert("You have entered an invalid email address!"); 
 
      document.form1.text1.focus(); 
 
      event.preventDefault(); 
 
     } 
 
    } 
 
</script>